Nelson said they spend more hours keeping their high tunnels clean--picking up berries that have naturally fallen to the ground--to help stop the spread of SWD.

"Without spraying at all, your berries will become infected quite rapidly," Nelson said. "So as much as we don't like to spray, we do need to spray to control this pest."

According to Bill Hutchison, a UMN professor of entomology and extension entomologist, about 20 percent of the state's growers have either had to suspend berry production or have gone out of business because of SWD.

UMN researchers have been working with a vineyard near Hastings on how to control SWD. This summer, they used exclusion netting on wine grapes.

"Exclusion netting is just a fine-mesh netting that's small enough to exclude SWD from getting in but it still allows... the climate to stay the same for the crop it's covering," said Dominique Ebbenga, a first-year master's student.

After reviewing some preliminary data, Ebbenga said, "We have some promising results showing that exclusion netting is excluding SWD."